In a biomagnification example, which group would typically have the highest mercury levels?

In a biomagnification example, which group would typically have the highest mercury levels?

• A. Phytoplankton
• B. Predators have higher mercury levels than smaller fish
• C. Small fish
• D. Bacteria

Answer: (B)

Biomagnification causes contaminants to become more concentrated as you move up the food chain. Mercury enters ecosystems and methylmercury accumulates in organisms; when a predator eats multiple contaminated prey over time, it accumulates mercury from all those meals, leading to higher levels in top predators. This is why predators typically have the highest mercury levels—their position at the top of the food web means repeated intake from many contaminated meals over a longer lifespan. Phytoplankton and bacteria sit at the base and accumulate less mercury, while small fish are intermediate; they accumulate more than producers but still less than the top predators because they are themselves prey for larger creatures.

Biomagnification causes contaminants to become more concentrated as you move up the food chain. Mercury enters ecosystems and methylmercury accumulates in organisms; when a predator eats multiple contaminated prey over time, it accumulates mercury from all those meals, leading to higher levels in top predators. This is why predators typically have the highest mercury levels—their position at the top of the food web means repeated intake from many contaminated meals over a longer lifespan. Phytoplankton and bacteria sit at the base and accumulate less mercury, while small fish are intermediate; they accumulate more than producers but still less than the top predators because they are themselves prey for larger creatures.